Fix unscrollable scrollers after closing a <dialog>.

third_party/WebKit/Source/core/style/ComputedStyle.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 3587 matching lines @@
   // It's sufficient to just check one direction, since it's illegal to have
   // visible on only one overflow value.
   bool isOverflowVisible() const {
     DCHECK(overflowX() != OverflowVisible || overflowX() == overflowY());
     return overflowX() == OverflowVisible;
   }
   bool isOverflowPaged() const {
     return overflowY() == OverflowPagedX || overflowY() == OverflowPagedY;
   }
 
+  // Visibility utility functions.
+  bool visibleToHitTesting() const {
+    return visibility() == EVisibility::Visible && pointerEvents() != PE_NONE;
+  }
+
   // Animation utility functions.
   bool shouldCompositeForCurrentAnimations() const {
     return hasCurrentOpacityAnimation() || hasCurrentTransformAnimation() ||
            hasCurrentFilterAnimation() || hasCurrentBackdropFilterAnimation();
   }
   bool isRunningAnimationOnCompositor() const {
     return isRunningOpacityAnimationOnCompositor() ||
            isRunningTransformAnimationOnCompositor() ||
            isRunningFilterAnimationOnCompositor() ||
            isRunningBackdropFilterAnimationOnCompositor();
@@ skipping 495 matching lines @@
   m_nonInheritedData.m_pseudoBits |= 1 << (pseudo - 1);
 }
 
 inline bool ComputedStyle::hasPseudoElementStyle() const {
   return m_nonInheritedData.m_pseudoBits & ElementPseudoIdMask;
 }
 
 }  // namespace blink
 
 #endif  // ComputedStyle_h